The ribbon will be cut shortly on Glanbias brand new dairy processing plant in Belview.
The 185 million euro development has been specially designed to cater for the planned increase in milk production once milk quotas are abolished and will supply infant milk formula to countries around the world.
Taoiseach Enda Kenny, Jobs Minster Richard Bruton, Agriculture Minister Simon Coveney and EU AGriculture Commissioner Phil Hogan are all there for official opening
Chief executive of Glanbia ingredients Jim Bergin says its a historic development for them and their suppliers.